Parcelamento e intervalo da aplicação de calcário

The purpose of this investigation was to study the effect of parcelled lime applied at variable intervals, as can he seen below, during three years (1959/60, 1960/61 and 1961/62). As described in the present paper, this field experiment was conducted at the Pindamonhangaba Experiment Station using the corn hybrid HMD-6999, and had eight treatments with four replications, as follows: Treatments 1959/60  1960/61 1961/62 1  NPK +lime NPK NPK 2  NPK NPK + lime  NPK 3  NPK NPK NPK + lime 4  NPK + 1/2lime NPK + 1/2  lime NPK 5  NPK NPK + 1/2 lime NPK + 1/2lime 6 NPK + 1/2  lime NPK NPK + 1/2lime 7  NPK + 1/3lime  NPK + 1/3  lime NPK + 1/3lime 8  NPK NPK NPK Rate of lime was 4.25 tons to the hectare. The efficiency of the treatments was evaluated through their effects on the pH and H+ + Al+3. and on calcium and magnesium, in the grain yield as well as in the soil. The results indicated that the lime applications increased the yield of corn. The different intervals of time, when parcelled lime was applied, had no influence on the corn yield. The variation of pH and H+ + Al+3 was very small during the development of the experiment. The motion into the soil profile of the calcium and magneisum was considerable and rapid.